Recording Facetime with Audio on iPhone/iPad

I have been using iphone for 20 years now. My parents are old, I bought them iphones 5 years ago because we love talking over the facetime, we live in different countries and facetime quality is really good.

However, we want to record our facetimes, we don't know how much we have each other so we want to keep the memories saved.

iphone lack of support for recording facetimes with audio is crazy bad. I understand that there are legal concerns, but this should be easy to solve, just add an alert to the call when it is been recorded such that both sides know that it is recorded.

I wish there was a way to record facetimes with audio on iphone/ipad. Please reconsider this feature.